Improvement in valve-motions for steam-pumps



UNITED STATES PATENT OEErcE.

HERMANN T. C. KRAUSS, OF FISHKILL, NEW YORK.

IMPROVEMENT IN VALVE-MOTIONS FOR STEAM-PUMPS.

Specication forming' part of Letters Patent No. 154,683, dated September 1,1874; application liled June 24, 1874,

To all whom 'it may concern Beit known that I, HERMANN T. C. KRAUss, of Fishkill, in the county of Dutchess and State of New York, have invented a certain new and Improved Valve-Motion for Steam-Pumps, of which lthe following is aspeciication:

Thisinvention is illustrated in the accompanying drawing, in which-- Figure 1 represents a longitudinal section. Fig. 2 is a horizontal section. y

Similar letters indicate corresponding parts.

This invention consists in the combination of a trip-lever with the piston-rod of a directacting steam-pump, which trip-lever is connected by a secondary lever and link with the valve-rod, and acts against stops secured to the frame ofthe pump in such a manner that the steam-valve is thrown, and the steam is `A changed, before the steam-piston has fully reached either 'end of its stroke, and thereby the slamming of said piston against the cylinder-heads is prevented, and a steady motion is imparted to the pump.

In the drawing, the letter A designates the steam-cylinder of a direct-acting steam-pump. B is the pump-cylinder; C, the steam-piston, and D the pump-piston, which connects with the steam-piston bythe rod E. The steamcylinder lis supplied with steam through a pipe, a, which leads into the valve-chamber b, from whicheXtend ports cc into the cylinder. In the chamber b moves the valve d, which, in the example represented by the drawing, consists of two piston-valves, and as the position of this valve is changed the ports c c' are altern ately brought in communication with the exhaust-port c. The valve-rod j' connects by a link, g, with a lever, IL, which has its fulcruni on a pivot, i, secured in the upper portion of a yoke, F, which rises from the frame of the pump. The lever h connects by a pivot, j, with the trip-lever G, which straddles the piston-rod E and swings on two screws, k, that are secured in a sleeve, l, fastened on the piston-rod. In the lower end of the trip-lever is mounted a friction-roller, m. As `the pistonrod reciprocates this friction-roller comes iu contact with stops n n', which are secured in the frame of the pump, and which are adjustable by set-screws o and slots p. The pivot j, which forms the connection between the lever h and the trip-lever G, moves in a slot, g, in the lever h. l

When the steam-piston moves in the direction of the arrow marked on it in Fig. l, the valve d is in such a position that steam is admitted through the port c', while the port c communicates with the exhaust-port e. As the piston approaches the end of the stroke the roller m of the trip-lever strikes the stop n, and by the action of said trip-lever on the lever h the valve d is suddenly changed before the piston has reached the end of its stroke, so that steam enters the cylinder A through the lport c, and the piston (l is cushioned and prevented from slamming against the cylinder-head. At the same time a full head of steam is brought to bear on the piston, so that the same will commence its return-stroke with full power.

By adjusting the stops n n' the time for throwing the steam-valve may be changed according to the stroke of the steam-piston and to thespeed with which the same moves, and this time may be further changed by increasing the length of the trip-lever below the piston-rod.

By this arrangement a direct-acting steampump can be operated with great regularity, and the parts of my valve-motion are so situated that they can be readily reached at all times, whenever it may be desirable.

What I claim as new, and desire to secure by Letters Patent, is-

The combination'of a trip-lever, G, hinged to the piston-rod E, with the lever 1 1-, valverod f, valve d, stops n n', and with the steampiston ot' a direct-acting steam-pump, all constructed and operatingsubstantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand. y

HERMANN T. C. KRAUSS.

Witnesses:

SAMUEL HowE,v J. J. HUPFER. 

